Fix tax per item issue & check currency key

database/migrations/2022_03_04_051438_calculate_base_values_for_invoice_items.php

@@ -0,0 +1,38 @@
+<?php
+
+use Crater\Models\InvoiceItem;
+use Crater\Models\Tax;
+use Illuminate\Database\Migrations\Migration;
+
+class CalculateBaseValuesForInvoiceItems extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        $taxes = Tax::whereRelation('invoiceItem', 'base_amount', null)->get();
+
+        if ($taxes) {
+            $taxes->map(function ($tax) {
+                $invoiceItem = InvoiceItem::find($tax->invoice_item_id);
+                $exchange_rate = $invoiceItem->exchange_rate;
+                $tax->exchange_rate = $exchange_rate;
+                $tax->base_amount = $tax->amount * $exchange_rate;
+                $tax->save();
+            });
+        }
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        //
+    }
+}